From 3277b69d734b9c90b44ebde4ede005717e2c3b2e Mon Sep 17 00:00:00 2001
From: ed <ed@FreeBSD.org>
Date: Tue, 2 Jun 2009 17:52:33 +0000
Subject: Import LLVM, at r72732.

---
 lib/ExecutionEngine/Interpreter/Interpreter.cpp | 104 ++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 lib/ExecutionEngine/Interpreter/Interpreter.cpp

(limited to 'lib/ExecutionEngine/Interpreter/Interpreter.cpp')

diff --git a/lib/ExecutionEngine/Interpreter/Interpreter.cpp b/lib/ExecutionEngine/Interpreter/Interpreter.cpp
new file mode 100644
index 0000000..ded65d5
--- /dev/null
+++ b/lib/ExecutionEngine/Interpreter/Interpreter.cpp
@@ -0,0 +1,104 @@
+//===- Interpreter.cpp - Top-Level LLVM Interpreter Implementation --------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the top-level functionality for the LLVM interpreter.
+// This interpreter is designed to be a very simple, portable, inefficient
+// interpreter.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Interpreter.h"
+#include "llvm/CodeGen/IntrinsicLowering.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Module.h"
+#include "llvm/ModuleProvider.h"
+#include <cstring>
+using namespace llvm;
+
+namespace {
+
+static struct RegisterInterp {
+  RegisterInterp() { Interpreter::Register(); }
+} InterpRegistrator;
+
+}
+
+namespace llvm {
+  void LinkInInterpreter() {
+  }
+}
+
+/// create - Create a new interpreter object.  This can never fail.
+///
+ExecutionEngine *Interpreter::create(ModuleProvider *MP, std::string* ErrStr,
+                                     CodeGenOpt::Level OptLevel /*unused*/) {
+  // Tell this ModuleProvide to materialize and release the module
+  if (!MP->materializeModule(ErrStr))
+    // We got an error, just return 0
+    return 0;
+
+  return new Interpreter(MP);
+}
+
+//===----------------------------------------------------------------------===//
+// Interpreter ctor - Initialize stuff
+//
+Interpreter::Interpreter(ModuleProvider *M)
+  : ExecutionEngine(M), TD(M->getModule()) {
+      
+  memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped));
+  setTargetData(&TD);
+  // Initialize the "backend"
+  initializeExecutionEngine();
+  initializeExternalFunctions();
+  emitGlobals();
+
+  IL = new IntrinsicLowering(TD);
+}
+
+Interpreter::~Interpreter() {
+  delete IL;
+}
+
+void Interpreter::runAtExitHandlers () {
+  while (!AtExitHandlers.empty()) {
+    callFunction(AtExitHandlers.back(), std::vector<GenericValue>());
+    AtExitHandlers.pop_back();
+    run();
+  }
+}
+
+/// run - Start execution with the specified function and arguments.
+///
+GenericValue
+Interpreter::runFunction(Function *F,
+                         const std::vector<GenericValue> &ArgValues) {
+  assert (F && "Function *F was null at entry to run()");
+
+  // Try extra hard not to pass extra args to a function that isn't
+  // expecting them.  C programmers frequently bend the rules and
+  // declare main() with fewer parameters than it actually gets
+  // passed, and the interpreter barfs if you pass a function more
+  // parameters than it is declared to take. This does not attempt to
+  // take into account gratuitous differences in declared types,
+  // though.
+  std::vector<GenericValue> ActualArgs;
+  const unsigned ArgCount = F->getFunctionType()->getNumParams();
+  for (unsigned i = 0; i < ArgCount; ++i)
+    ActualArgs.push_back(ArgValues[i]);
+
+  // Set up the function call.
+  callFunction(F, ActualArgs);
+
+  // Start executing the function.
+  run();
+
+  return ExitValue;
+}
+
-- 
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